ABSTRACT
Chittagong city of Bangladesh has been seriously eroded by the flood disaster. The evaluation of flood loss can provide a reference for Chittagong to guide life and production and carry out post-disaster assessments. Taking Chittagong city as the research object, this paper, based on DEM data and land-use dataset, extracts the scope of flood inundation by the passive inundation analysis method and assesses the losses caused by floods to the city's ecological environment. The results show that: (1) The lands in Chittagong city were mainly used as farmlands and woodlands with a quite high land use degree; (2) there existed a quadratic polynomial growth relationship between the inundation area and the height of water level, and when the water level rose to 4m, farmlands became the main land use type in each inundated area; (3) from the perspective of ecological environment, the flood caused the greatest loss to wetlands. The relevant research results can provide effective assistance for government departments in disaster prevention.
